sql server 2016 step by step: creating alwayson ......sql server 2016 step by step: creating...

SQL Server 2016 Step by Step: Creating

AlwaysOn Availability Group

Table of Contents • Prerequisites:

• This environment:

• SQL Server Installation

• Failover Cluster Installation

• Windows Failover Clustering Configuration for Always On Availability Groups

• Configure Cluster Quorum Settings

• Listener

Always On Availability Groups is an enterprise-level high-availability and disaster recovery solution introduced in SQL

Server 2012 to enable you to maximize availability for one or more user databases. Always On Availability Groups

requires that the SQL Server instances reside on Windows Server Failover Clustering (WSFC) nodes.

Prerequisites: • Ensure that the system is not a domain controller.

• Ensure that each computer is running Windows Server 2012 or later versions.

• Ensure that each computer is a node in a Windows Server Failover Clustering (WSFC) cluster.

This environment: OS - Windows 2012 R2

SQL Server - SQL Server 2016 Enterprise Edition

SQL Server Installation AlWays on availability group requires the standard installation, "New SQL Server stand-alone installation..." follow the

instructions and Click Next, Next, Next, Install

Failover Cluster Installation First, we need to add the Windows Failover Cluster Feature to all the nodes running the SQL Server instances that we

will configure as replicas.

Open the Server Manager => select Add roles and features.

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Click Next till Select Features dialog box.

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Select the Failover Clustering checkbox

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Click Install to install the Failover Clustering feature.

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Windows Failover Clustering

Configuration for Always On Availability

Groups Open Server Manager and select "Fail over Cluster Manager".

Select Failover Cluster Manager and select the Option Create Cluster OR You can right-click on the Failover Cluster

Manager and select Create Cluster menu.

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You will Create Cluster Wizard

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Add the Nodes you want be in the Cluster and then click Next

You will be getting a validation warning. Select Yes to Validate the Cluster nodes

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Select the option Run all tests

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NOTE: The Cluster Validation Wizard is expected to return several Warning messages, especially if you will not be

using shared storage. Other than that if you find any error messages you need to fix them prior to creating the

Windows Server Failover Cluster.

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In the Access Point for Administering the Cluster dialog box, enter the Cluster name and virtual IP address for

Windows Server Failover Cluster , then click Next.

Verify that the configuration is successful in Summary.

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Configure Cluster Quorum Settings Quorum is that it is a configuration database for the cluster and is stored on a shared location, accessible to all of the

nodes in a cluster.

In Case of Even number of nodes (but not a multi-site cluster) Node and Disk Majority Quorum configuration is

recommended. If you don't have a shared storage Node and File Share Majority is recommended. Here it will be

configuring a FileShare Witness quorum.

It is recommended that you configure the quorum size to be 500 MB. This size is the minimum required for an

efficient NTFS partition. Larger sizes are allowable but are not currently needed.

Click on Your Cluster Select Configure Cluster Quorum Setting from the More action menu.

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In the Select Quorum Witness page, select the Configure a file share witness option. Click Next.

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Type the path of the file share that you want to use in the File Share Path: text box. Click Next.

It is recommended to have the share folder on a different node than the node participating on Cluster

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In the Confirmation page, click Next.

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In the Summary page, click Finish.

Enable AlwaysOn Availability Groups

Feature on SQL Server 2016

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We can now proceed with enabling the AlwaysOn Availability Groups feature in SQL Server 2016. This is possible after

install and configuring the Windows Failover Cluster on all the nodes.

Open SQL Server Configuration Manager - > SQL Server Properties - [SQL Server (SQLAG01)]

In the Properties dialog box, select the AlwaysOn High Availability tab. Check the Enable AlwaysOn Availability Groups

check box. This will prompt you to restart the SQL Server service. Click OK.

Restart the SQL Server service.

Configure SQL Server 2016 AlwaysOn

Availability Groups Go to Management Studio, right click Availability Groups and click New Availability Group Wizard.

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Specify Availability Group Name . This group name is SQLAVG2016. Then click Next.

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Choose Database

Here you can see whether the DB meets the prerequisites

• Database should be in full recovery mode.

• You should make a full backup to add the DB into the Availability Group

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Specify Replicas

This page applies to the New Availability Group Wizard and the Add Replica to Availability Group Wizard of SQL

Server 2016.

If a server instance that you to use to host a secondary replica is not listed by the Availability Replicas grid, click the

Add Replica button.

Add Azure Replica button to create virtual machines with secondary replicas in Windows Azure.

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Adding Secondary Replica

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Endpoints

Use this tab to verify any existing database mirroring endpoints and also, if this endpoint is lacking on a server

instance whose service accounts use Windows Authentication, create the endpoint automatically.

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Backup Preference

Use this tab to specify your backup preference for the availability group as a whole and your backup priorities for the

individual availability replicas.

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Listener An availability group listener is a virtual network name (VNN) to which clients can connect in order to access a

database in a primary or secondary replica of an AlwaysOn availability group. You point applications to the listener

(which is registered with DNS) and directs traffic in the AG.

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Select Data Synchronization

Use the Always On Select Initial Data Synchronization page to indicate your preference for initial data synchronization

of new secondary databases. This page is shared by three wizards—the New Availability Group Wizard, the Add

Replica to Availability Group Wizard, and the Add Database to Availability Group Wizard.

The possible choices include Full, Join only, or Skip initial data synchronization. Before you select Full or Join only

ensure that your environment meets the prerequisites.

For each primary database, the Full option performs several operations in one workflow: create a full and log backup

of the primary database, create the corresponding secondary databases by restoring these backups on every server

instance that is hosting a secondary replica, and join each secondary database to availability group.

Select this option only if your environment meets the following prerequisites for using full initial data synchronization,

and you want the wizard to automatically start data synchronization.

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